Hey! This would require some heavy code modifications to the brightbox theme, much more than we could support in a single forum thread. I am very sorry for that but if you really want to make that happen you would either need to work yourself through the files or hire someone who is familiar to wordpress and can pull that off.

I have opened a thread on themeforest for authors who can be hired and know their way around WordPress. You might want to contact one of those:

I’ll ask Kriesi if there’s a difference between Brightbox and Corona regarding WordPress Multilingual Plugin but I’m pretty sure that both use the same framework and portfolio code and therefore they’ll use WPML the same way.

Actually the following is the case: I submitted brightbox to the WPML team and they told me how to modify the theme to make it 100% compatible. This was a long process and in the end the portfolio still isnt 100% up to the task, so i decided to not use the badge on any other themes until I found a way to modify the behavior of either the plugin or the themes to my likings. So from your list I would also say that 2 fits the most. both work very well with WPML but the portfolio section has some issues that are not yet resolved